Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent Detection
In this paper, we propose a novel scheme to integrate an optical hybrid based on standing wave with graphene photodetector (GPD). Different from optical hybrids based on multimode interference (MMI) couplers, the proposed optical hybrid can be miniaturized by constructing a standing wave field in a...
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doaj-c937aef80cba4ea7b5eec97b2295c9ae2021-03-29T17:52:58ZengIEEEIEEE Photonics Journal1943-06552018-01-0110611210.1109/JPHOT.2018.28636958425975Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent DetectionJing Xu0Yanli Zhao1https://orcid.org/0000-0001-5925-3561Ke Wen2Junjie Tu3Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaIn this paper, we propose a novel scheme to integrate an optical hybrid based on standing wave with graphene photodetector (GPD). Different from optical hybrids based on multimode interference (MMI) couplers, the proposed optical hybrid can be miniaturized by constructing a standing wave field in a silicon strip waveguide. The waveguide-integrated GPD with symmetric electrodes is adopted as an ultrafast self-differential photodetector (SDPD), instead of conventional balanced-photodetectors (BPDs) based on p-i-n photodiodes in a coherent receiver. By placing two sysmmetric interdigitated electrodes of the SDPD at nodes and antinodes of the standing wave, it is convenient to realize the integration of the proposed optical hybrid with the graphene-based SDPD, which can effectively reduce the complexity of a coherent receiver and meet the future demand for wide bandwidth. The finite-difference time-domain method was used to calculate optical absorption for demonstrating operation feasibility. Finally, device bandwidth and effective responsivity have been discussed. In theory, our scheme would provide a feasible way to realize a high-speed compact coherent receiver.https://ieeexplore.ieee.org/document/8425975/Integrated optics devicescoherent detectionoptical hybridgraphene photodetector |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jing Xu Yanli Zhao Ke Wen Junjie Tu |
spellingShingle |
Jing Xu Yanli Zhao Ke Wen Junjie Tu Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent Detection IEEE Photonics Journal Integrated optics devices coherent detection optical hybrid graphene photodetector |
author_facet |
Jing Xu Yanli Zhao Ke Wen Junjie Tu |
author_sort |
Jing Xu |
title |
Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent Detection |
title_short |
Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent Detection |
title_full |
Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent Detection |
title_fullStr |
Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent Detection |
title_full_unstemmed |
Ultracompact Optical Hybrid Based on Standing Wave Integrated With Graphene-Based Photodetector for Coherent Detection |
title_sort |
ultracompact optical hybrid based on standing wave integrated with graphene-based photodetector for coherent detection |
publisher |
IEEE |
series |
IEEE Photonics Journal |
issn |
1943-0655 |
publishDate |
2018-01-01 |
description |
In this paper, we propose a novel scheme to integrate an optical hybrid based on standing wave with graphene photodetector (GPD). Different from optical hybrids based on multimode interference (MMI) couplers, the proposed optical hybrid can be miniaturized by constructing a standing wave field in a silicon strip waveguide. The waveguide-integrated GPD with symmetric electrodes is adopted as an ultrafast self-differential photodetector (SDPD), instead of conventional balanced-photodetectors (BPDs) based on p-i-n photodiodes in a coherent receiver. By placing two sysmmetric interdigitated electrodes of the SDPD at nodes and antinodes of the standing wave, it is convenient to realize the integration of the proposed optical hybrid with the graphene-based SDPD, which can effectively reduce the complexity of a coherent receiver and meet the future demand for wide bandwidth. The finite-difference time-domain method was used to calculate optical absorption for demonstrating operation feasibility. Finally, device bandwidth and effective responsivity have been discussed. In theory, our scheme would provide a feasible way to realize a high-speed compact coherent receiver. |
topic |
Integrated optics devices coherent detection optical hybrid graphene photodetector |
url |
https://ieeexplore.ieee.org/document/8425975/ |
work_keys_str_mv |
AT jingxu ultracompactopticalhybridbasedonstandingwaveintegratedwithgraphenebasedphotodetectorforcoherentdetection AT yanlizhao ultracompactopticalhybridbasedonstandingwaveintegratedwithgraphenebasedphotodetectorforcoherentdetection AT kewen ultracompactopticalhybridbasedonstandingwaveintegratedwithgraphenebasedphotodetectorforcoherentdetection AT junjietu ultracompactopticalhybridbasedonstandingwaveintegratedwithgraphenebasedphotodetectorforcoherentdetection |
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1724197212040200192 |